21626304543 has 6 divisors (see below), whose sum is σ = 31237995464. Its totient is φ = 14417536356.

The previous prime is 21626304499. The next prime is 21626304547. The reversal of 21626304543 is 34540362612.

21626304543 is a `hidden beast` number, since 2 + 16 + 2 + 630 + 4 + 5 + 4 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21626304543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21626304498 and 21626304507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626304547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1201461355 + ... + 1201461372.

Almost surely, 2^21626304543 is an apocalyptic number.

21626304543 is a deficient number, since it is larger than the sum of its proper divisors (9611690921).

21626304543 is a wasteful number, since it uses less digits than its factorization.

21626304543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402922733 (or 2402922730 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 21626304543 in words is "twenty-one billion, six hundred twenty-six million, three hundred four thousand, five hundred forty-three".